840730586309 has 2 divisors, whose sum is σ = 840730586310. Its totient is φ = 840730586308.

The previous prime is 840730586287. The next prime is 840730586413. The reversal of 840730586309 is 903685037048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 566138866084 + 274591720225 = 752422^2 + 524015^2 .

It is a cyclic number.

It is not a de Polignac number, because 840730586309 - 2¹² = 840730582213 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840730586609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420365293154 + 420365293155.

It is an arithmetic number, because the mean of its divisors is an integer number (420365293155).

Almost surely, 2^840730586309 is an apocalyptic number.

It is an amenable number.

840730586309 is a deficient number, since it is larger than the sum of its proper divisors (1).

840730586309 is an equidigital number, since it uses as much as digits as its factorization.

840730586309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4354560, while the sum is 53.

The spelling of 840730586309 in words is "eight hundred forty billion, seven hundred thirty million, five hundred eighty-six thousand, three hundred nine".